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Limb segment load inhibits post activation depression of soleus H-reflex in humans

Identifieur interne : 001679 ( Pmc/Checkpoint ); précédent : 001678; suivant : 001680

Limb segment load inhibits post activation depression of soleus H-reflex in humans

Auteurs : Shih-Chiao Tseng ; Richard K. Shields

Source :

RBID : PMC:3380139

Abstract

Objective

We investigated the effect of various doses of limb segment load on soleus H-reflex amplitude and post activation depression in healthy individuals. We also explored the influence of limb segment load on spinal circuitry in one individual with chronic SCI.

Methods

28 healthy adults and one SCI subject received compressive loads applied to the top of their knee at varied doses of load (10%, 25%, and 50% of the body weight). Soleus H-reflexes were measured before (baseline) and during the loading phase.

Results

There were no significant differences in H-reflex amplitudes during the 50 % BW load-on phase as compared to either baseline session or the load-off phase. However, the post activation depression was decreased over 9% (p < 0.05) during the load-on phase compared to the load-off phase and scaled according to load (50%>25%>10%). The post activation depression ratio also appears less responsive to varying loads after chronic SCI.

Conclusions

Limb segment load decreases post-activation depression in humans. These findings suggest that the mechanism associated with post activation depression is modulated by limb segment load, and may be influenced by spinal reorganization after SCI.

Significance

Future studies will determine if various levels of spasticity modulate the response of limb segment load on post activation depression in those with acute and chronic SCI.


Url:
DOI: 10.1016/j.clinph.2012.02.068
PubMed: 22418592
PubMed Central: 3380139


Affiliations:


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PMC:3380139

Le document en format XML

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<name sortKey="Tseng, Shih Chiao" sort="Tseng, Shih Chiao" uniqKey="Tseng S" first="Shih-Chiao" last="Tseng">Shih-Chiao Tseng</name>
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<name sortKey="Shields, Richard K" sort="Shields, Richard K" uniqKey="Shields R" first="Richard K." last="Shields">Richard K. Shields</name>
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<title>Objective</title>
<p id="P1">We investigated the effect of various doses of limb segment load on soleus H-reflex amplitude and post activation depression in healthy individuals. We also explored the influence of limb segment load on spinal circuitry in one individual with chronic SCI.</p>
</sec>
<sec id="S2">
<title>Methods</title>
<p id="P2">28 healthy adults and one SCI subject received compressive loads applied to the top of their knee at varied doses of load (10%, 25%, and 50% of the body weight). Soleus H-reflexes were measured before (baseline) and during the loading phase.</p>
</sec>
<sec id="S3">
<title>Results</title>
<p id="P3">There were no significant differences in H-reflex amplitudes during the 50 % BW load-on phase as compared to either baseline session or the load-off phase. However, the post activation depression was decreased over 9% (p < 0.05) during the load-on phase compared to the load-off phase and scaled according to load (50%>25%>10%). The post activation depression ratio also appears less responsive to varying loads after chronic SCI.</p>
</sec>
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<title>Conclusions</title>
<p id="P4">Limb segment load decreases post-activation depression in humans. These findings suggest that the mechanism associated with post activation depression is modulated by limb segment load, and may be influenced by spinal reorganization after SCI.</p>
</sec>
<sec id="S5">
<title>Significance</title>
<p id="P5">Future studies will determine if various levels of spasticity modulate the response of limb segment load on post activation depression in those with acute and chronic SCI.</p>
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<article-title>Limb segment load inhibits post activation depression of soleus H-reflex in humans</article-title>
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<aff id="A1">Physical Therapy & Rehabilitation Science Department, University of Iowa, Carver College of Medicine, Iowa City, Iowa, USA.</aff>
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<bold>Corresponding Author:</bold>
Richard K. Shields, PT, PhD, Physical Therapy & Rehabilitation Science, Carver College of Medicine, University of Iowa, 1-252 Medical Education Building, Iowa City, Iowa 52242, TEL: 319-335-9803, FAX: 319-335-9707,
<email>richard-shields@uiowa.edu</email>
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<year>2012</year>
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<month>9</month>
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<volume>123</volume>
<issue>9</issue>
<fpage>1836</fpage>
<lpage>1845</lpage>
<abstract>
<sec id="S1">
<title>Objective</title>
<p id="P1">We investigated the effect of various doses of limb segment load on soleus H-reflex amplitude and post activation depression in healthy individuals. We also explored the influence of limb segment load on spinal circuitry in one individual with chronic SCI.</p>
</sec>
<sec id="S2">
<title>Methods</title>
<p id="P2">28 healthy adults and one SCI subject received compressive loads applied to the top of their knee at varied doses of load (10%, 25%, and 50% of the body weight). Soleus H-reflexes were measured before (baseline) and during the loading phase.</p>
</sec>
<sec id="S3">
<title>Results</title>
<p id="P3">There were no significant differences in H-reflex amplitudes during the 50 % BW load-on phase as compared to either baseline session or the load-off phase. However, the post activation depression was decreased over 9% (p < 0.05) during the load-on phase compared to the load-off phase and scaled according to load (50%>25%>10%). The post activation depression ratio also appears less responsive to varying loads after chronic SCI.</p>
</sec>
<sec id="S4">
<title>Conclusions</title>
<p id="P4">Limb segment load decreases post-activation depression in humans. These findings suggest that the mechanism associated with post activation depression is modulated by limb segment load, and may be influenced by spinal reorganization after SCI.</p>
</sec>
<sec id="S5">
<title>Significance</title>
<p id="P5">Future studies will determine if various levels of spasticity modulate the response of limb segment load on post activation depression in those with acute and chronic SCI.</p>
</sec>
</abstract>
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<kwd>Compression</kwd>
<kwd>homosynaptic depression</kwd>
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<funding-source country="United States">National Institute of Child Health & Human Development : NICHD</funding-source>
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